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The moving beam of large-scale water press's position holding precisely plays a great important role in works piece quality. Firstly a precisely synchronism control system is studied, then the factors which result in the decline of the synchronism control precision are analyzed, finally a new control strategy based on structure invariance is afforded.
The precise synchronism control system of heavy hydraulic press is studied and the factors that result in the decline of the synchronism control precision are analyzed through building the mathematic model. In order to eliminate the influences of the stochastic disturbances, a sliding mode controller without steady-state error is presented.
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